Hans Lassen (physicist)

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Hans Lassen (born February 12, 1897 in Ketting on Alsen ; † October 27, 1974 in Berlin ) was a German scientist.

Life

After graduating from high school in Sonderburg, he was deployed as a soldier in the First World War 1914–1918. 1919–1924 Hans Lassen studied physics, mathematics and chemistry in Kiel and Jena with Winfried Otto Schumann , where he obtained his doctorate with the thesis Experimental investigation in electrical circuits with mercury vapor rectifiers . For a short time he worked at Siemens & Halske in Berlin and in 1925 became Karl Försterling's assistant at the Institute for Theoretical Physics at the University of Cologne , where he dealt specifically with the propagation of electromagnetic waves and their overreaching . Two years later he switched to Hans Rukop and in 1933 became a private lecturer.

In 1928 he married Annemarie Hollaender (* 1901), the daughter of the Cologne regional court director. Her son Lars Lassen (* 1929) became a professor of physics in Heidelberg.

After Lassen was fired in 1935 because of his Jewish wife, he worked again at Siemens in Berlin until 1946. With the resumption of studies at the Humboldt University in Berlin , he received an extraordinary professorship for physics and in 1948 became head of the 1st Physics Institute. In April 1949 he was appointed full professor and director of the new physics institute by the newly founded Free University of Berlin . In 1965 he retired .

Hans Lassen died in Berlin in 1974 at the age of 77. His grave is in the Dahlem forest cemetery .

Publications

  • Ionization of the atmosphere and its influence on the propagation of the short electrical waves of wireless telegraphy ; 1926 (see Hermann Dänzer )
  • Frequency dependence of the spark voltage in air ; 1930
  • Short wave propagation in the Earth's magnetic field ; 1933
  • New interference phenomena when fast electrons pass through crystals ; 1935
  • Wave propagation theory ; 1941
  • Theory of the birefringence of electromagnetic waves in an ionized gas and the influence of a constant magnetic field (ionosphere) ; 1947
  • Propagation of shortwave echo signals ; 1948
  • Evaluation of ionospheric observations ; 1954
  • With Ludwig Bergmann : emission, propagation and absorption of electromagnetic waves ; 1940 ( textbook on wireless communications technology, volume 2)
  • Revised with Bergmann and Kurt Fränz : antennas and expansion ; 1956

literature

  • I. Berndt: From the history of the Physics Institute of the Free University of Berlin, lecture at the festive colloquium on the 60th birthday of Professor Dr. Hans Lassen
  • Physical sheets , issue 13, 1957, p. 84
  • Karl Keil:  Lassen, Hans. In: New German Biography (NDB). Volume 13, Duncker & Humblot, Berlin 1982, ISBN 3-428-00194-X , p. 674 ( digitized version ).

Web links

Individual evidence

  1. ^ Karl Keil:  Lassen, Hans. In: New German Biography (NDB). Volume 13, Duncker & Humblot, Berlin 1982, ISBN 3-428-00194-X , p. 674 ( digitized version ).
  2. ↑ Journal article. In: Electrical Engineering (archive for electrical engineering); Retrieved March 24, 2010
  3. ↑ Leo Haupts: The University of Cologne in the transition from National Socialism to the Federal Republic ; P. 357
  4. ↑ History info on the website of the Free University of Berlin; Retrieved March 23, 2010
  5. ^ Hans-Jürgen Mende : Lexicon of Berlin burial places . Pharus-Plan, Berlin 2018, ISBN 978-3-86514-206-1 , p. 584.
  6. ↑ On the absorption of Hertzian waves in ionized gases . ( Memento from June 7, 2013 in the Internet Archive ) In: Annalen der Physik , 2, 1929 (dissertation)
  7. ↑ Journal article. In: Natural Sciences , with a short version and a sample page; completely as PDF
personal data
SURNAME Let, Hans
BRIEF DESCRIPTION German physicist
DATE OF BIRTH February 12, 1897
PLACE OF BIRTH Ketting on Als
DATE OF DEATH October 27, 1974
Place of death Berlin